As some of you know, I am moving up to Colorado from Texas this summer and have an FJ60 with the stock Aisin carb. Do I need to swap the jets when I get to Colorado or does the carb automatically adjust for the altitude? I have heard that the HAC valve does this, but I want to make sure before I get up there and can't drive over 20 MPH!

I looked at the CO dept of Rev website and found that vehicles 25 years and older qualify for collector plates but on the emissions pages, the vehicles exempted didn't include collectors plated vehicles. Also on the emissions page, they still have 1982 as the cutoff for the 2 speed tail pipe test vs. the RM240 dyno test. Are you sure that there is a 25 year limit on emissions?